Severe Thunderstorm Warning 6, NWS Pendleton, OR

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
915 AM PDT SAT MAY 24 2003

A DEEP LOW PRESSURE SYSTEM IS CURRENTLY MOVING TOWARDS THE COAST.
THE ASSOCIATED COLD FRONT IS EXPECTED TO HANG UP ON THE CASCADES
BRIEFLY BEFORE RELEASING LATER THIS AFTERNOON. INSTABILITY WISE THE
PARAMETERS ARE IN PLACE FOR AREAS OF DEEP CONVECTION MAINLY ALONG
THE EASTERN MOUNTAINS AND EASTWARDS. EXPECT THUNDERSTORM DEVELOPMENT
BY LATE AFTERNOON WITH GUSTY OUTFLOW WINDS...LOCALLY HEAVY RAIN AND
SOME HAIL. CURRENTLY A LINE OF ACCAS IS MOVING NORTH THROUGH CENTRAL
OREGON INDICATING THE INSTABILITY OF THE ATMOSPHERE. WILL UP DATE
THE FORECAST FOR THE EAST SLOPES OF THE OREGON/WASHINGTON CASCADES
FOR ISOLD THUNDERSTORMS THERE THIS AFTERNOON. IN ADDITION THERE WILL
BE A FEW TEMPERATURE CHANGES. BREEZY WITH AND BEHIND THE COLD FRONT
LOOK GOOD. ANOTHER SHORT WAVE IS EXPECTED TO MOVE THROUGH THE TROUGH
SUNDAY AFTERNOON. ENOUGH INSTABILITY WILL REMAIN ACROSS THE EXTREME
EASTERN ZONES TO WARRANT SOME ISOLD THUNDERSTORMS THERE FOR
TOMORROW. TOBIN

PDT 230  ALW 230  PSC 020  YKM 020

.KPDT...NONE.

ORZ041>050-WAZ024>030-251300-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
500 AM PDT SAT MAY 24 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE... SATURDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND
THIS EVENING OVER THE MOUNTAINS OF NORTHEAST OREGON. THE SHOWERS AND
THUNDERSTORMS WILL MOVE NORTHEAST INTO SOUTHEAST WASHINGTON THIS
EVENING. A COLD FRONT WILL SWEEP ACROSS THE REGION LATE THIS
AFTERNOON AND THIS EVENING. A VERY MOIST AND UNSTABLE AIR MASS HAS
MOVED INTO THE REGION AHEAD OF THE FRONT AND THIS WILL SET THE STAGE
FOR THE DEVELOPMENT OF STRONG THUNDERSTORMS...WHICH WILL HAVE THE
POTENTIAL FOR PRODUCING LARGE HAIL AND DAMAGING WINDS THIS AFTERNOON
AND THIS EVENING.

.DAYS TWO THROUGH SEVEN... SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY THIS AFTERNOON AND THIS EVENING TO
DEAL WITH POSSIBLE SEVERE WEATHER ASSOCIATED WITH THUNDERSTORMS.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.